CN104653313A

CN104653313A - Method And System For Improved Dilution Purging

Info

Publication number: CN104653313A
Application number: CN201410640643.2A
Authority: CN
Inventors: D·J·斯泰尔斯; S·L·鲍尔; J·A·海蒂奇; R·R·埃奥里奥; G·苏妮拉
Original assignee: Ford Global Technologies LLC
Current assignee: Ford Global Technologies LLC
Priority date: 2013-11-20
Filing date: 2014-11-13
Publication date: 2015-05-27
Anticipated expiration: 2034-11-13
Also published as: US10294874B2; CN104653313B; RU2684140C2; RU2014145814A3; DE102014223089A1; RU2014145814A; US20150136076A1

Abstract

Methods and systems are provided for expediting EGR purging in a hybrid vehicle during transient operations, such as tip-out to lower load conditions. In response to decreasing engine torque demand, engine fueling is disabled and a motor is used to spin the engine unfueled until a desired LP-EGR rate is achieved. Alternatively, engine operation is maintained with EGR disabled until the desired LP-EGR rate is achieved, and the excess engine torque generated is stored in a system battery.

Description

The method and system that the dilution improved purges

Technical field

The application relates to for improving the method and system purging (purging) low pressure EGR during light load operation from motor.

Background technique

Part exhaust is recycled to engine aspirating system from Exhuster of engine by exhaust gas recirculatioon (EGR) system, to improve fuel economy and vehicular discharge by reduction restriction loss and combustion temperature.In turbo charged direct injection engine, low pressure EGR (LP-EGR) loop can be implemented.Exhaust is recycled to the gas-entered passageway of turbocharger compressor upstream by LP-EGR loop from the exhaust passage in turbine downstream.

But, due to the precompactors position that EGR transmits, significant transmission delay can be there is between EGR valve and firing chamber.Particularly, exhaust gas debris can need pass through turbocharger compressor, high-pressure air introducing pipeline, charger-air cooler and intake manifold before arrival firing chamber.Due to the result of transmission delay, during needing as EGR the operating mode reduced rapidly, such as during accelerator releasing to running on the lower load, the more dilution than expecting in air inlet system, can be there is.The existence of the inlet air dilution increased at low load can increase the tendency of stability problems and engine fire.

The people such as Ma at US 6,014, solve a kind of example approach of additional residue shown in 959.Wherein, provide between EGR closure and primary air air inlet shutter and be rigidly connected, thus contact the movement of EGR closure according to the movement of main throttle.This allows always to be to provide and becomes the EGR of fixed proportion to dilute with inlet air stream.

Summary of the invention

But the present inventor has recognized that the potential problems of this approach at this.Exemplarily, be subject to, fully not solve transmission delay in limited time at the fuel economy benefit of LP-EGR.Such as, EGR dilution can cause providing LP-EGR at some low-load point places with contacting of inlet air stream, does not wherein realize the fuel economy benefit from EGR at these some places.In some cases, the fuel consumption be associated with the transmission of the LP-EGR at low-load point place can even be had.Like this, may not purge rapidly in this type systematic and do not affect air stream from the LP-EGR of air inlet system.As another example, because be that wherein combustion system is the limited point diluted most compared with low-load point, so the EGR that they may be limited to higher load point place transmits.Like this, its attainable peak E GR speed during can being limited in high load.Corrosion and condensation that in engine aspirating system, the existence of excessive dilution also can make compressor be subject to from retaining EGR.In addition, the condensation of increase can occur in the charger-air cooler place of boosting engine system due to the stream of the EGR by cooler.The condensation increased can need extra anti-condensation measure.

The present inventor has recognized that at least some in the problems referred to above can solve to purge rapidly LP-EGR by using the motor/generator of hybrid vehicle system.In one example, this is realized by a kind of method of hybrid vehicle system, the method comprises: the engine load that response reduces operates motor when there being EGR simultaneously, forbids that fuel to motor uses motor torsional moment to advance this vehicle simultaneously; And rotate unfed engine direct via generator and be less than threshold value to the EGR of air inlet system.By this way, LP-EGR can be purged rapidly and the moment of torsion do not affected to wheel.

Exemplarily, during middle load to high load operating mode, hybrid vehicle system can operate with the engine mode of engine combustion, carrys out propelled vehicles wheel to provide Engine torque.Further, during engine mode, low pressure EGR (LP-EGR) can flow to engine intake duct from Exhuster of engine, to provide additional fuel economy benefit and fuel draining benefit.Response accelerator releasing is running on the lower load extremely comparatively, can forbid spraying to the fuel of motor, and can be used to propelled vehicles from the motor torsional moment of electric motor/generator.During running on the lower load, EGR can be optional in motor, and EGR can need to be purged rapidly.Therefore, from motor removing LP-EGR, unfed motor can be rotated via generator for accelerating.Like this, during rotation, each can the maintenance in air inlet shutter and EGR valve, opens completely, is replaced by new charge air to allow this EGR.The rotating speed of engine revolution can based on the engine speed before prohibition of fuel injection.Can continue for some time via generator rotary engine until LP-EGR (amount, flow etc.) is lower than threshold value.In one example, rotation can continue until all LP-EGR have been replaced by new charge air.Then, once LP-EGR is fully purged, then motor can rotate to static and maintain shut down, reset until torque demand is high enough to demand motor.Meanwhile, vehicle can continue to be pushed into via motor torsional moment.

By this way, can accelerate to purge EGR from engine intake duct.By rotating unfed motor via motor/generator on one's own initiative, and air inlet shutter and EGR valve are opened, and the pump function of rotary engine is enough used to inhale fresh air and discharges EGR from intake manifold.Like this, its situation making the EGR level in intake manifold can reduce more possible than other is faster.In addition, comparatively high-engine moment of torsion and battery charge can be kept, purge EGR simultaneously.By reducing rapidly air inlet EGR level in low-load conditions when motor is shut down, higher EGR speed can be realized when motor is reset subsequently.Like this, it significantly improves engine efficiency, particularly at intermediate engine speed-load area in high-engine speed-load region.By replacing EGR with fresh air, the evaporation of water and hydrocarbon condensation product increases, thus reduces them at in-engine concentration and the needs to anti-condensation measure.In addition, the reduction of condensation decreases corrosion and the degeneration of compressor and charger-air cooler.Generally speaking, the performance of boosting motor is improved.

Should be appreciated that provide foregoing invention content in order to introduce in simplified form further describe in a specific embodiment selected by concept.This does not also mean that the key or essential characteristic of establishing theme required for protection, and its scope is uniquely limited by the claim of embodiment of enclosing.In addition, theme required for protection is not limited to solve the above-mentioned or any disadvantageous mode of execution pointed out of any part in the present invention.

Accompanying drawing explanation

Fig. 1 illustrates the schematic diagram of hybrid electric vehicle system.

Fig. 2 illustrates the schematic diagram of the firing chamber of the engine system of Fig. 1.

Fig. 3 illustrates the exemplary engine system being configured with exhaust gas recirculatioon (EGR) ability.

Fig. 4 illustrate for application drawing 1 hybrid vehicle system with accelerate low pressure EGR purge high level flow chart.

Fig. 5 illustrates example EGR planning (schedule) under selected engine speed-load condition.

Fig. 6 illustrates the exemplary operations purged according to the quickening EGR in hybrid electric vehicle of the present disclosure.

Embodiment

Below describing to relate to uses the motor/generator of hybrid vehicle system (Vehicular system of such as Fig. 1) to accelerate to purge from motor (engine system of such as Fig. 2-3) system and method for EGR in low-load conditions.When operating motor vehicle driven by mixed power when EGR flow with engine mode, the engine load that response reduces, the EGR transmission to motor can need rapid minimizing.During this type of operating mode, controller can be configured execution control routine, the example routine of such as Fig. 4, to forbid fuel to motor and to use motor torsional moment propelled vehicles.In addition, controller can use motor torsional moment to rotate unfed motor a period of time, until fully purge EGR from the intake manifold of motor.Alternately, if Vehicular system battery can accept charging, then controller can be forbidden EGR and operate motor when EGR valve is closed, and the excessive Engine torque generated is stored as battery charge simultaneously.Illustrate that example adjusts with reference to figure 6.By this way, during power operation subsequently, higher EGR planning can be realized, particularly under middle engine speed-load condition to high-engine speed-load operating mode (Fig. 5).Generally speaking, engine performance is improved.

Fig. 1 illustrates the hybrid propulsion system 100 of vehicle.In the embodiment depicted, vehicle is hybrid electric vehicle (HEV).Propulsion system 100 comprises the explosive motor 10 with multiple cylinder 30.Fuel can be provided to each cylinder of motor 10 from the fuel system (not shown) comprising one or more fuel tank, one or more petrolift and sparger 66.

Power is sent to speed changer 44 via torque input shaft 18 by motor 10.In described example, speed changer 44 is the dynamic branch speed changers (or transaxle) comprising planetary gear set 22 and one or more swing pinion element.Speed changer 44 also comprises generator 24 and electric motor 26.Because generator 24 and electric motor 26 all can be used as motor or generator operation, they also can be called as motor.Moment of torsion exports from speed changer 44, for via power transmission gear device 34, torque output shaft 19 and differential mechanism and axle assembly 36 propelled vehicles draught wheel 52.

Generator 24 can be connected to electric motor 26 with driving, and to make in generator 24 and electric motor 26 each all can use the electric energy from electrical energy storage device to operate, and this electrical energy storage device is depicted as battery 54 in this article.In certain embodiments, the energy conversion device of such as transducer can be connected between battery and motor, exports so that the DC of battery is exported the AC converted to for motor.But in alternative embodiments, transducer can be configured in electric motor.

Electric motor 26 can with regenerating-mode operation, that is, it can as generator operation, to absorb the energy from vehicle movement and/or motor, and is converted to by the kinetic energy of absorption and is applicable to being stored in the form of energy in battery 54.In addition, electric motor 26 can as required as motor or generator operation, to increase or to absorb the moment of torsion provided by motor.

Planetary gear set 22 comprises ring gear 42, sun gear 43 and planetary pinion frame component 46.Ring gear and sun gear can be coupled to each other via gear carrier.First input side of planetary gear set 22 is coupled to motor 10, and the second input side of planetary gear set 22 is coupled to generator 24.The outlet side of planetary gear set is connected to vehicle draught wheel 52 via the power transmission gear device 34 comprising one or more engaging gear element 60-68.In a kind of example, engaging gear element 60-68 can be stepping speed change gear, and wherein gear carrier assembly 46 can by torque distribution to stepping speed change gear.Teeth parts 62,64 and 66 are installed on countershaft 17, and wherein teeth parts 64 engage the teeth parts 70 of electrical motor driven.Electric motor 26 actuation gear element 70, it serves as the moment of torsion input of counter shaft gear device.Like this, planetary carrier 46 (and therefore motor and generator) can be coupled to vehicle wheel and motor via one or more teeth parts.Hybrid propulsion system 100 can operate in various embodiments, comprises full mixed power system, and wherein vehicle is only cooperated by motor and generator and drives, or only by electrical motor driven, or driven by its combination.Alternately, also can adopt auxiliary or light hybrid embodiment, wherein motor is the main source of moment of torsion, and electric motor such as optionally adds moment of torsion during specific operation during the event of stepping on the gas.

Such as, vehicle can be driven by engine mode, wherein motor 10 is used as the main source of moment of torsion in conjunction with generator (its provide reaction torque to planetary gear set and be allowed for the clean planet output torque that advances) operation, for being provided with power (if vehicle operates in a motor mode, then generator also can provide moment of torsion to wheel) to wheel 52.During engine mode, fuel can be fed to motor 10 from fuel tank via fuel injector 66, motor can be rotated in fueling situation, to be provided for the moment of torsion of propelled vehicles.Particularly, engine power is sent to the ring gear of planetary gear set.Meanwhile, generator provides moment of torsion to sun gear 43, thus produces the reaction torque to motor.Therefore, moment of torsion is outputted to the gear 62,64,66 on countershaft 17 by planetary carrier, power is sent to wheel 52 by then.In addition, motor can export than needing the more moment of torsion for advancing through operation, and in this case, extra power (in either a generation) is absorbed to charge to battery 54 by generator or is other vehicle load supply electric power.

In another example, vehicle can be driven in an aiding mode, wherein motor 10 operates and is used as the main source of the moment of torsion being provided with power to wheel 52, and electric motor is used as additional source of torque, to act synergistically with the moment of torsion provided by motor 10 and to supplement the moment of torsion provided by motor 10.During auxiliary mode, as under engine mode, fuel is supplied to motor 10, to rotate the motor of fueling, and provides moment of torsion to vehicle wheel.

In another example, vehicle can be driven with tail-off pattern or electric model, and wherein battery powered electric motor 26 operates and is used as the exclusive source of the moment of torsion of wheels 52.Therefore, during electric model, no matter whether motor rotates, and does not all have fuel to be injected in motor 10.Such as, braking, low speed, low-load, traffic lights place stop time etc. period, can electric model be adopted.Particularly, motor power is sent to teeth parts 70, and it drives the teeth parts on countershaft 17 then, and wheels 52 thereon.

Propulsion system 100 can also comprise control system, this control system comprises the controller 12 being configured and receiving information from multiple sensor 16 (its various example describes in this article), and control signal is sent to multiple actuator 81 (its various example describes in this article).As a kind of example, sensor 16 can comprise various pressure and temperature sensor, fuel level sensor, various exhaust sensors etc.Various actuator can comprise such as gear train, cylinder fuel injectors (not shown) and be connected to the air intake door etc. of engine intake manifold (not shown).Fig. 2-3 place elaborates additional sensor and actuator.Controller 12 can receive the input data-triggered actuator after input data, process input data and response process from various sensor, inputs data based on what correspond to one or more program and be programmed into instruction in controller or code described in these.About Fig. 4, example control program is described herein.

Fig. 2 describes the firing chamber of (Fig. 1's) motor 10 or the example embodiment of cylinder.Motor 10 can receive the controling parameters from the control system comprising controller 12 and the input via input device 132 from vehicle operator 130.In this example, input device 132 comprises accelerator pedal and the pedal position sensor 134 for generating proportional pedal position signal PP.The cylinder (herein also referred to as " firing chamber ") 30 of motor 10 can be included in the chamber wall 136 being wherein provided with piston 138.Piston 138 can be coupled to bent axle 140, makes the to-and-fro motion of piston be converted into the rotary motion of bent axle.Bent axle 140 can be coupled at least one driving wheel of passenger stock via transmission system.Further, starter motor can be coupled to bent axle 140 via flywheel, can realize the start-up function of motor 10.Particularly, (Fig. 1's) generator 24 and the power transmission system comprising (Fig. 1's) motor 26 can be coupled to bent axle and be provided for the moment of torsion of engine start rotation.

Cylinder 30 can receive inlet air via a series of inlet air passage 142,144 and 146.Inlet air passage 146 can be communicated with other cylinders of the motor 10 except cylinder 30.In certain embodiments, one or more in gas-entered passageway can comprise increasing apparatus, such as turbosupercharger or mechanical supercharger.Such as, Fig. 2 illustrates the motor 10 being configured with turbosupercharger, and this turbosupercharger comprises the compressor 174 be arranged between gas-entered passageway 142 and gas-entered passageway 144 and the exhaust driven gas turbine 176 arranged along exhaust passage 148.Compressor 174 can provide power by exhaust driven gas turbine 176 via axle 180 at least in part, and wherein increasing apparatus is configured to turbosupercharger.But be provided with in other examples of mechanical supercharger at such as motor 10, exhaust driven gas turbine 176 can be left in the basket alternatively, wherein compressor 174 can provide power by the machinery input from motor or motor.The closure 20 comprising Rectifier plate 164 can be provided along the gas-entered passageway of motor, for changing the flow velocity and/or the pressure that are provided to the inlet air of engine cylinder.Such as, closure 20 can be arranged on the downstream of compressor 174, as shown in Figure 2, or alternately may be provided in the upstream of compressor 174.In certain embodiments, as elaborated with reference to figure 3, charger-air cooler (CAC) can be positioned at the downstream of compressor 174 and the upstream of closure 20, is sent to the boost air inflation of motor for cooling.Alternately, CAC can be positioned at the downstream of the closure being incorporated into intake manifold 146.

Exhaust passage 148 can receive exhaust from other cylinders of the motor 10 except cylinder 30.Shown exhaust sensor 128 is coupled to the exhaust passage 148 of emission control system 178 upstream.Such as, sensor 128 can be selected from the various appropriate sensor for providing the instruction of evacuating air/fuel ratio, such as linear oxygen sensors or UEGO (general or wide area exhaust oxygen), bifurcation lambda sensor or EGO (as shown), HEGO (EGO of heating), NOx, HC or CO sensor.Emission control system 178 can be three-way catalyst (TWC), NOx trap, other various emission control systems or its combination.

Delivery temperature can be estimated by one or more temperature transducer (not shown) being arranged in exhaust passage 148.Alternately, delivery temperature can be inferred based on engine operating condition (such as rotating speed, load, air fuel ratio (AFR), ignition lag etc.).Further, delivery temperature can be calculated by one or more exhaust sensor 128.Should be clear, delivery temperature alternately can be estimated by the combination in any of the temperature estimation method listed herein.

Each cylinder of motor 10 can comprise one or more intake valve and one or more exhaust valve.Such as, shown cylinder 30 comprises at least one inlet poppet valves 150 and at least one exhaust poppet valve 156 of being positioned at cylinder 30 upper area.In certain embodiments, each cylinder (comprising cylinder 30) of motor 10 can comprise at least two inlet poppet valves and at least two exhaust poppet valve that are positioned at cylinder upper region.

Intake valve 150 can by controller 12 via cam-actuated system 151 by cam-actuated control.Similarly, exhaust valve 156 can be controlled via cam-actuated system 153 by controller 12.Cam-actuated system 151 and 153 all can comprise one or more cam, and one or more that cam profile can be utilized to convert in (CPS), variable cam timing (VCT), Variable Valve Time (VVT) and/or lift range variable (VVL) system, wherein these systems can be operated to change air door operation by controller 12.The position of intake valve 150 and exhaust valve 156 can be determined by valve position sensor 155 and 157 respectively.In alternative embodiments, intake valve and/or exhaust valve can by electric air valve actuator control.Such as, cylinder 30 alternately can comprise via the intake valve of electric air valve actuator control with via the exhaust valve of cam-actuated control comprising CPS and/or VCT system.In other embodiment, intake valve and exhaust valve can be controlled by common valve actuator or actuating system or Variable Valve Time actuator or actuating system.

Cylinder 30 can have certain compression ratio, and it is when piston 138 is in the volume ratio that lower dead center and piston are in top dead center.Routinely, compression ratio is in the scope of 9:1 to 13:1.But in some examples using different fuel, compression ratio can increase.This can such as occur when using higher octane fuel or use to have the fuel of higher potential enthalpy of vaporization.Directly spray if used, then because it causes compression ratio also can increase on the impact of engine knock.

In certain embodiments, each cylinder of motor 10 can comprise for initiating burning fire flower plug 192.Response carrys out the spark advance signal SA of self-controller 12, and ignition system 190 can provide ignition spark via spark plug 192 to firing chamber 30 in a selected mode of operation.But in certain embodiments, spark plug 192 can be removed, such as when motor 10 can initiate burning by automatic ignition or burner oil (situation of some diesel engine is like this).

In certain embodiments, each cylinder of motor 10 can be configured with one or more sparger, for providing pinking or prefiring suppression fluid to it.In certain embodiments, fluid can be fuel, and wherein sparger is also referred to as fuel injector.As non-limiting example, shown cylinder 30 comprises a fuel injector 166.Shown fuel injector 166 is directly connected to cylinder 30, injects fuel directly into pro rata cylinder for the signal FPW pulse width received from controller 12 via electronic driver 168.By this way, fuel injector 166 provides the what is called of fuel directly to spray (hereinafter also referred to as " DI ") in firing chamber 30.Although sparger 166 shows for side spray emitter by Fig. 2, it also can be positioned at above piston, such as near the position of spark plug 192.When with alcoholic fuel operation motor, due to the comparatively low volatility of some alcoholic fuels, such piston can improve mixing and burning.Alternately, sparger can be positioned at intake valve above and near intake valve, to improve mixing.

Fuel can be transported to fuel injector 166 from the high-pressure fuel system 8 comprising fuel tank, petrolift and fuel rail.Alternately, fuel can be transmitted with lower pressure by single-stage petrolift, in this case, if the timing that direct fuel sprays can than more limited during use high-pressure fuel system during compression stroke.Further, although not shown, fuel tank can have the pressure transducer providing signal to controller 12.Should be clear, in alternative embodiments, sparger 166 can be the passage injector of intake duct fuel being provided to cylinder 30 upstream.

As mentioned above, Fig. 2 illustrates an only cylinder of multicylinder engine.Therefore, each cylinder can comprise one group of intake valve/exhaust valve, one or more fuel injector, the spark plug etc. of himself similarly.

Fuel tank in fuel system 8 can hold the fuel with different quality (such as heterogeneity).These differences can comprise different alcohol content, different octane, different vaporization heat, different fuel mixture and/or its combination etc.In a kind of example, it is a kind of fuel of gasoline and the another kind of fuel being ethanol or methyl alcohol that the fuel with different alcohol content can comprise.In another example, motor can by gasoline as the first material and by alcohol fuel mixture such as E85 (it is the approximate ethanol of 85% and the gasoline of 15%) or M85 (it is the approximate methyl alcohol of 85% and the gasoline of 15%) as the second material.Other alcohol fuels can be the mixtures etc. of the mixture of alcohol and water, alcohol, water and gasoline.

Further, in the disclosed embodiment, the discharge portion of expectation is routed to air induction passage 142 from exhaust passage 148 by egr system.Fig. 2 illustrates LP-EGR system, and wherein LP-EGR is routed to compressor 174 upstream by LP-EGR passage 240 from turbine 176 downstream.The amount being provided to the LP-EGR of gas-entered passageway 142 can be changed by controller 12 via LP-EGR valve 242.Similarly, also can there is HP-EGR system (illustrating at Fig. 3), wherein HP-EGR is routed to compressor 174 downstream by HP-EGR passage from turbine 176 upstream.The amount being provided to the HP-EGR of gas-entered passageway 146 can be changed by controller 12 via special HP-EGR valve.Such as, HP-EGR system can comprise HP-EGR cooler (see Fig. 3), and LP-EGR system can comprise LP-EGR cooler 246, to discharge the heat from EGR gas to engine coolant.

Under some conditions, egr system can be used to regulate the temperature of air in firing chamber 30 and fuel mixture.Therefore, measure or estimate that EGR mass flow rate can be desirable.EGR sensor can be disposed in EGR channel, and can provide one or more instruction in mass flow rate, pressure, temperature, oxygen concentration and exhaust concentration.In certain embodiments, one or more sensor can be positioned in LP-EGR passage 240, to provide one or more instruction in the pressure of the exhaust by the recirculation of LP-EGR passage, temperature and air fuel ratio.The exhaust turned to by LP-EGR passage 240 can be positioned at the mixing point place of LP-EGR passage 240 and gas-entered passageway 142 junction by new charge Dilution air.Particularly, by adjusting LP-EGR valve 242 in phase with low-pressure air drawing-in system (LP AIS) closure 230 (elaborating further at Fig. 3), the dilution of EGR flow can be adjusted.

The percent dilution of LP-EGR flow can be inferred from the output of the sensor 245 in EGR air-flow.Particularly, sensor 245 can be positioned in the downstream of LP-EGR valve 242, makes it possible to accurately determine that LP-EGR dilutes.Sensor 245 can be on EGR Δ pressure on such as aperture, valve or Δ pressure on hot line or hot film anemometer flowmeter.Lambda sensor such as UEGO sensor 372 also can be used to measure the EGR in main admission line 142 or 144.

Controller 12 is illustrated as microcomputer in fig. 2, and it comprises microprocessor unit (CPU) 106, input/output end port (I/O) 108, the electronic storage medium for executable program and calibration value being illustrated as ROM chip (ROM) 110 in this concrete example, random access memory (RAM) 112, keep-alive storage (KAM) 114 and data/address bus.Controller 12 can receive the various signals from the sensor being connected to motor 10, except those signals discussed before, also comprises the measurement of the Mass Air Flow (MAF) of the introducing from air mass flow sensor 122; From the engineer coolant temperature (ECT) of temperature transducer 116 being connected to cooling collar 118; From the PIP Profile Igntion PickUp signal (PIP) of hall effect sensor 120 (or other types) being connected to bent axle 140; From the throttle position (TP) of throttle position sensor; Carry out the absolute manifold pressure signal (MAP) of sensor 124, from the cylinder AFR of EGO sensor 128 and the abnormal combustion from detonation sensor.Engine rotational speed signal RPM can be generated according to signal PIP by controller 12.Manifold pressure signal MAP from manifold pressure sensor can be used to provide the vacuum in intake manifold or pressure instruction.

Storage medium ROM (read-only memory) 110 can be programmed by mechanized data, and this mechanized data represents the instruction performed by processor 106, and this instruction is for performing method described below and expection but other variants specifically do not listed.

Forward Fig. 3 to now, it illustrates the example embodiment 300 of the engine system 10 (engine system of such as Fig. 1-2) comprising multiple cylinder block and exhaust gas recycling system.Embodiment 300 describes the turbocharged engine system comprising multi-cylinder internal combustion engine 10 and bi-turbo 320 and 330.As a kind of non-limiting example, engine system 300 can be included as a part for the propulsion system of passenger stock.Engine system 300 can receive the inlet air via gas-entered passageway 340.Gas-entered passageway 340 can comprise air filter 356 and EGR closure 230.Engine system 300 can be separating engine system, and wherein gas-entered passageway 340 becomes the first parallel feed passage and the second parallel feed passage in the downstream branch of EGR closure 230, eachly includes turbocharger compressor.Particularly, the compressor 322 being directed to turbosupercharger 320 at least partially via the first parallel feed passage 342 of inlet air, and at least another part of inlet air is directed to the compressor 332 of turbosupercharger 330 via the second parallel feed passage 344 of gas-entered passageway 340.

The first portion of the total inlet air compressed by compressor 322 can be supplied to intake manifold 360 via the gas-entered passageway 346 of the first parallel branch.By this way, gas-entered passageway 342 and 346 forms the first parallel branch of the air induction system of motor.Similarly, the second portion of total inlet air can compress via compressor 332, and wherein it can be supplied to intake manifold 360 via the gas-entered passageway 348 of the second parallel branch.Therefore, gas-entered passageway 344 and 348 forms the second parallel branch of the air induction system of motor.As shown in Figure 3, the inlet air from gas-entered passageway 346 and 348 can reconfigure via public gas-entered passageway 349 before arrival intake manifold 360, and wherein inlet air can be provided to motor.

One EGR closure 230 can be positioned in the engine intake duct of the first parallel feed passage 342 and the second parallel feed passage 344 upstream, and the second air intake door 358 can be positioned in the engine intake duct in the first parallel feed passage 342 and the gas-entered passageway 346 of the second parallel feed passage 344 downstream and the first parallel branch and gas-entered passageway 348 downstream of the second parallel branch, such as, in public gas-entered passageway 349.

In some instances, intake manifold 360 can comprise the intake manifold pressure sensor 382 for estimating mainfold presure (MAP) and/or the manifold surface temperature sensor 383 for estimating manifold air temperature (MCT), is eachly all communicated with controller 12.Gas-entered passageway 349 can comprise charger-air cooler (CAC) 354 and/or closure (such as second section valve 358).The position of closure 358 can be adjusted via by the throttle actuator (not shown) being connected to controller 12 communicatedly by control system.Can provide anti-surge valve 352 with via recirculation line 350 optionally recirculated through the flowing of the compressor stage of turbosupercharger 320 and 330.As a kind of example, when the inlet air pressure of upstream of compressor reaches threshold value, anti-surge valve 352 can be opened to enable the flowing by recirculation line 350.

Air conduit 349 can also comprise air inlet lambda sensor 372.In one example, this lambda sensor is UEGO sensor.Air inlet lambda sensor can be configured the estimated value of the oxygen content provided about the fresh air received in intake manifold.In addition, when EGR flow, the change of sensor place oxygen concentration can be used to infer EGR amount and be used as EGR flow accurately and control.In described example, lambda sensor 372 is positioned in the upstream of closure 358 and the downstream of charger-air cooler 354.But in alternative embodiments, lambda sensor can be positioned in CAC upstream.Pressure transducer 373 can be positioned in the side of lambda sensor for the suction pressure estimating to receive residing for the output of lambda sensor.Because the output of lambda sensor affects by suction pressure, thus can know with reference to suction pressure place with reference to lambda sensor output.In a kind of example, be throttle inlet pressure (TIP) with reference to suction pressure, wherein pressure transducer 374 is TIP sensors.In alternative example, be the mainfold presure (MAP) as sensed by MAP sensor 382 with reference to suction pressure.

Motor 10 can comprise multiple cylinder 30.In described example, motor 10 comprises with six of V deployment arrangements cylinders.Particularly, six cylinders are disposed on two exhaust casings 313 and 315, and wherein every exhaust casing comprises three cylinders.In alternative example, motor 10 can comprise two or more cylinders, such as 3,4,5,8,10 or more cylinders.These different cylinders can be divided equally and are arranged in the alternative configuration of such as V-arrangement, lineal shape, box-shaped etc.Each cylinder 30 can be configured with fuel injector 66.In described example, fuel injector 66 is direct In-cylinder injector.But in other examples, fuel injector 66 can be configured to the fuel injector based on intake duct.

The inlet air being fed to each cylinder 30 (at this, also referred to as firing chamber 30) via public gas-entered passageway 349 can be used to fuel combustion, and then products of combustion can be discharged via the specific parallel exhaust passage of cylinder block.In described example, the first row cylinder 313 of motor 10 can discharge products of combustion via the first parallel exhaust passage 317, and second row cylinder 315 can discharge products of combustion via the second parallel exhaust passage 319.Each in first exhaust passage 319 parallel with second, parallel exhaust passage 317 can also comprise turbocharger turbine.Particularly, the products of combustion of discharging via exhaust passage 317 can be conducted through the exhaust driven gas turbine 324 of turbosupercharger 320, and it can provide mechanical work via axle 326 to compressor 322 then, to provide compression to inlet air.Alternately, some exhausts flowing through exhaust passage 317 can walk around turbine 324 via the turbine bypass passage 323 such as controlled by wastegate 328.Similarly, the products of combustion of discharging via exhaust passage 319 can be conducted through the exhaust driven gas turbine 334 of turbosupercharger 330, it can provide mechanical work via axle 336 to compressor 332 then, to provide compression to the inlet air of the second branch of the gas handling system flowing through motor.Alternately, some exhausts flowing through exhaust passage 319 can walk around turbine 334 via the turbine bypass passage 333 such as controlled by wastegate 328.

In some instances, exhaust driven gas turbine 324 and 334 can be configured to variable geometry turbine, its middle controller 12 can adjust the position of turbine wheel sheet (or blade), to obtain to change and to give the energy level of their respective compressors from exhaust stream.Alternately, exhaust driven gas turbine 324 and 334 can be configured to variable nozzle turbine, and its middle controller 12 can adjust the position of turbine nozzle, to obtain to change and to give the energy level of their respective compressors from exhaust stream.Such as, control system can be configured the blade or the nozzle location that change exhaust driven gas turbine 324 and 334 via respective actuator independently.

Exhaust in first parallel exhaust passage 317 can be directed to air via the parallel exhaust passage 370 of branch, and the exhaust in the second parallel exhaust passage 319 can be directed to air via the parallel exhaust passage 380 of branch.Exhaust passage 370 and 380 can comprise one or more exhaust aftertreatment equipment, such as catalyzer and one or more exhaust sensor.

Motor 10 can also comprise one or more exhaust gas recirculatioon (EGR) passage or loop, for being recycled to intake manifold from gas exhaust manifold at least partially by what be vented.These can comprise for providing the high pressure EGR loop of high pressure EGR (HP-EGR) and for providing the low pressure EGR loop of low pressure EGR (LP-EGR).In a kind of example, can HP-EGR be provided when the boosting do not provided by turbosupercharger 320,330, and there is turbosupercharger boosting and/or when delivery temperature can provide LP-EGR higher than during threshold value.In other example, both HP-EGR and LP-EGR can be provided simultaneously.

In described example, motor 10 can comprise low pressure EGR loop 202, for the first parallel feed passage 342 at least some exhaust being recycled to compressor 322 upstream from the parallel exhaust passage 370 of first branch in turbine 324 downstream.In certain embodiments, the second low pressure EGR loop (not shown) can be provided equally, for the second parallel feed passage 344 at least some exhaust being recycled to compressor 332 upstream from the parallel exhaust passage 380 of second branch in turbine 334 downstream.LP-EGR loop 202 can comprise for controlling by the EGR flow of loop (namely, the air displacement of recirculation) LP-EGR valve 204, and flow through the cooler for recycled exhaust gas 206 of the delivery temperature of EGR loop for reducing before being recycled in engine intake duct.Under some operating mode, cooler for recycled exhaust gas 206 also can be used to heating and flow through the exhaust of LP-EGR loop 202 to avoid droplets impact its on the compressor before exhaust enters compressor.

Motor 10 can also comprise the first high pressure EGR loop 208, for the parallel feed passage 346 at least some exhaust being recycled to first branch in compressor 322 downstream from the first parallel exhaust passage 317 of turbine 324 upstream.Similarly, motor can comprise the second high pressure EGR loop (not shown), for the parallel feed passage 348 at least some exhaust being recycled to second branch in compressor 322 downstream from the second parallel exhaust passage 318 of turbine 334 upstream.Can be controlled via HP-EGR valve 210 by the EGR flow of HP-EGR loop 208.Like this, HP-EGR can be ejected at the downstream of engine air throttle 358, to improve fluid ability under some conditions.Alternately, one or more HP EGR loop can comprise cooler for recycled exhaust gas (not shown).

PCV port 302 can be configured and crankcase ventilation gas (blow-by gas) is sent to engine intake manifold along the second parallel feed passage 344.In certain embodiments, can be controlled by special PCV port valve by the PCV air stream (such as, PCV stream) of PCV port 302.Similarly, purging port 304 can be configured and purge gas is sent to engine intake manifold from fuel system tank along passage 344.In certain embodiments, the sweep air flow by purging port 304 can be controlled by special purging port valve.

Humidity transducer 232 and pressure transducer 234 can be included in only in one (what describe at this is in the first parallel feed air passageways 342 instead of in the second parallel feed passage 344) in the parallel feed passage in EGR closure 230 downstream.Particularly, humidity transducer and pressure transducer can be included in do not receive PCV air or purging air gas-entered passageway in.Humidity transducer 232 can be configured the relative moisture estimating inlet air.In one embodiment, humidity transducer 232 is the UEGO sensors of the relative moisture be configured based on one or more voltage lower sensor output estimation inlet air.Because purging air and PCV air can obscure the result of humidity transducer, thus purge port and be positioned in the gas-entered passageway different from humidity transducer with PCV port.Alternately, they can be positioned in the downstream of humidity transducer.Pressure transducer 234 can be configured the pressure estimating inlet air.In certain embodiments, temperature transducer also can be included in the identical parallel feed passage of EGR closure 230 downstream or upstream.

Air inlet lambda sensor 372 can be used to estimate inlet air oxygen concentration, and infers the amount by the EGR flow of motor when EGR valve 204 is opened based on the change of air inlet oxygen concentration.Particularly, the change that sensor exports when opening EGR valve with there is no EGR situation under the reference point of (zero point) operation sensor compare.When operating under not having EGR situation based on distance, the change (such as, reducing) of amount of oxygen, can calculate the current EGR flow being provided to motor.Such as, when being applied to sensor with reference to voltage (Vs), pumping current (Ip) is exported by sensor.The change of oxygen concentration can with exported the pumping current (Δ Ip) that exports relative to the sensor when not having EGR (zero point) by sensor when there being EGR be changing into ratio.Based on the deviation of the EGR flow estimated apart from (or target) EGR flow of expection, further EGR can be performed and control.

Via the hydraulic actuating tappet being connected to valve actuating push rod, or via using the cam profile shifting mechanism of cam lobe, each intake valve of cylinder 30 and the position of exhaust valve can be regulated.Particularly, inlet valve cam actuating system 325 can comprise one or more cam, and can utilize variable cam timing or lift for intake valve and/or exhaust valve.In alternative embodiments, intake valve can be activated by electric air valve and control.Similarly, exhaust valve can be activated by cam-actuated system or electric air valve and control.

Engine system 300 can at least in part by comprise controller 12 control system 15 and from the input control of vehicle operator via input device (not shown).Shown control system 15 receives the information from multiple sensor 16 (its various example describes at this), and control signal is sent to multiple actuator 81.As a kind of example, sensor 16 can comprise humidity transducer 232, inlet air pressure transducer 234, MAP sensor 382, MCT sensor 383, TIP sensor 374 and inlet air lambda sensor 372.In some instances, public gas-entered passageway 349 can also comprise the throttle inlet temperature transducer for estimating closure air temperature (TCT).In other examples, one or more in EGR channel can comprise pressure transducer, temperature transducer and hot line or hot film anemometer flow transducer, for determining EGR flow characteristic.As another example, actuator 81 can comprise fuel injector 66, HP-EGR valve 210, LP-EGR valve 204, closure 358 and 230 and wastegate 328,338.Other actuators such as various additional valve and closure can be coupled to each position in engine system 300.Controller 12 can receive from the input data of each sensor, process input data and respond treated input data-triggered actuator, the instruction that described input data are programmed in controller based on corresponding to one or more program or code.Example control program is described herein about Fig. 4.

Forward Fig. 4 to now, it illustrates the example procedure 400 for the Vehicular system of application drawing 1.Particularly, the method for Fig. 4 enables low pressure EGR be purged from the engine system of Fig. 2-3 rapidly.Controller can the generator of optionally operating vehicle systems to rotate unfed motor during reduction load condition, thus rapidly replace air inlet EGR with new charge air.Alternately, if system battery can accept charging, then controller can when EGR is forbidden maneuvering engine in either a generation, to replace air inlet EGR with fresh air, use the excessive Engine torque of generation to charge the battery simultaneously.In both cases, improve the dilution tolerance of engine system, reduce the possibility of catching fire, and add attainable peak E GR speed during high load operation subsequently.

At 402 places, estimate and/or measure engine operating condition and vehicle operating parameter.These comprise such as brake pedal position, accelerator pedal position, operator's torque demand, battery state of charge (SOC), engine temperature (Teng), ambient temperature and humidity, atmospheric pressure (BP) etc.In a kind of example, hybrid vehicle system is dynamic branch/distribution type hybrid vehicle system.

At 404 places, mode of vehicle operation can be determined based on the operating mode estimated.Such as, at least based on the operator torque demands estimated and battery state of charge, can determine that vehicle is by with pure engine mode (wherein motor-powered vehicle wheel), auxiliary mode (wherein battery auxiliary engine drive vehicle) or electric-only mode (wherein only having battery-operated vehicle) operation.In a kind of example, if the moment of torsion of demand can only be provided by battery, then vehicle can operate with electric-only mode.In another example, if the moment of torsion of demand can not be provided by battery, then vehicle can operate with engine mode, or operates in an aiding mode.Vehicle can therefore with the operation mode determined.

At 406 places, can confirm that vehicle is under engine operation mode.Such as, can confirm that vehicle is under pure engine mode, vehicle is only pushed into Engine torque in this mode.Alternately, can confirm vehicle under auxiliary mode and this vehicle utilize Engine torque to be pushed at least in part.If do not confirm engine operation mode, then this program can terminate.

At 408 places, fuel can be sent to motor to operate motor and to generate the moment of torsion for propelled vehicles.At this, engine output torque can correspond to the required moment of torsion of vehicle propulsion.In a kind of example, based on engine operating condition (such as engine speed-load condition), motor can with boost operations and fuel via directly spraying the motor being sent to boosting.In addition, motor can be operated when EGR enables or flow.At this, be included in when low pressure EGR (LP-EGR) flows with EGR operation and operate.By making LP-EGR flow during power operation, reducing via pumping merit, pinking slows down, combustion efficiency is improved and enrichment reduces, and improves fuel economy.Be included in when the EGR valve be connected in LP-EGR passage is opened with low pressure EGR operation motor and operate motor.

In a kind of example, LP-EGR planning can be straight planning, and wherein LP-EGR is transmitted with fixed rate relative to air stream.LP-EGR comprises the exhaust gas debris of the cooling being recycled to the engine intake manifold of inlet air compressor upstream from the enmgine exhaust in exhaust driven gas turbine downstream.

Like this, EGR (HP-EGR, LP-EGR or both combinations) amount being sent to air inlet system can map based on the engine speed be stored in the storage of controller 12-load.In a kind of example, engine speed-load maps can comprise at least two kinds of LP-EGR operator schemes, and it comprises fixing operation pattern and variable operation mode.Fixed mode scope can be included in all engine speed in the normal range (NR) of power operation and load.Fixed mode can comprising under the very high engine speed of full-power and load " cutting down (taper out) " LPEGR, to avoid conflicting with engine performance.By contrast, variable EGR pattern can allow the variable EGR speed in the normal range (NR) of power operation.

At 410 places, can determine whether the engine load operating mode reduced exists.Particularly, can determine whether engine torque demand declines, and whether the engine torque demand operating mode reduced exists.Such as, the engine load/demand of reduction can operation response person's accelerator releasing pedal.Like this, during the engine load/demand reduced, the air stream to motor can reduce, and therefore, the LP-EGR to motor also can reduce.But, owing to there is large transmission delay between LP-EGR valve and firing chamber, so EGR may not reduce as required so fast.Particularly, because LP-EGR passage removes exhaust after turbine, and before compressor jet exhaust, thus there is large delay purging in EGR from intake manifold.This delay aggravates by exceeding the existence of the large boosting volume (such as, six times of volumes) of the engine displacement in some engine configurations.The delay purged causes combustion stability risk.Such as, the possibility of catching fire can be increased than the existence of required more dilution.

EGR speed is adopted to contribute to alleviating and postponing to purge some problems be associated relative to the straight EGR planning that air stream keeps constant.But, operate LP-EGR under the use of straight planning causes the comparatively low-load point not realizing fuel economy benefit at some.In fact, in some lower engine speed-loading point, operation LP-EGR causes fuel consumption.In addition, compressor can be exposed to EGR in low-load conditions, thus needs the measure to anticorrosive and condensation.Along with EGR flow is through charger-air cooler, additional condensation there will be, and this also needs to be solved.Under some running on the lower load, low-pressure air air inlet shutter also can need to be manipulated into driving EGR flow.In addition, because comparatively low-load point is that combustion system dilutes (EGR) the most limited point, plan compared with the straight EGR at low-load point restriction higher load point place.Such as, straight planning is limited in compared with peak E GR speed attainable under high-engine speed-load operating mode.Like this, the fuel economy benefit of its restriction LP-EGR.

Fig. 5 is to map the straight EGR planning of 500 depicted example.As shown therein, transmit the straight planning of EGR relative to air stream with fixed rate and be applied to engine speed-loading zone corresponding to district 502.Outside district 502, in district 504, do not use LP-EGR.Although the LP-EGR transmitting cooling with fixed rate provides significant fuel economy benefit in moderate rotation-load area (first half in district 502), this benefit is limited.Like this, it can be desirable for operating with more LP-EGR in this region.But due to large EGR transmission delay, this possibly cannot realize.In addition, the straight planning mapping 500 causes under low engine speed-load condition (Lower Half in district 502) to operate LP-EGR, can suffer potential fuel consumption under this operating mode.Like this, it can be desirable for not operating with any EGR in this region.But due in the transmission of precompactors position EGR and the large EGR transmission delay that causes, this possibly cannot realize.

The present inventor has recognized that the EGR in the motor new charge air replacement intake manifold by operating motor vehicle driven by mixed power at this, thus accelerates EGR purging.Particularly, the engine torque demand that response reduces or load, simultaneously with EGR flow operation motor, can forbid that fuel is to motor, and can rotate unfed motor via motor, until EGR fully purges from air inlet system.Alternately, if system battery can accept charging, then by forbidding EGR and operating motor to replace air inlet EGR with fresh air in either a generation, use excessive Engine torque to charge to system battery simultaneously, EGR can be accelerated and purge.

Such as, by accelerating the purging of LP-EGR, EGR plans that the planning of the mapping 550 of such as Fig. 5 can be implemented.Particularly, by allowing the rapid purging of LP-EGR in low-load conditions, it is possible for operating when low engine speed-load area (such as shown in district 554) is in and does not have LP-EGR.By reducing the running of the LP-EGR cooled at low load, and rely on the internal EGR of heat on the contrary, fuel economy and engine performance improve in this operating area.In addition, by allowing purge rapidly and under the engine load reduced, EGR reset to zero LP-EGR operating mode substantially, high peaks EGR speed can be realized during increase engine load subsequently.Such as, be possible at moderate rotation-load area (such as district 552 shown in) with higher LP-EGR Rate operation.

Get back to Fig. 4, the engine load that response reduces and torque demand, at 411 places, can estimate and/or measure battery state of charge (SOC), and by itself and threshold value charge ratio comparatively.This program also determines that whether battery state of charge is higher than threshold value electric charge.Threshold value electric charge can be restricted to and allow few additional engine working time and charging subsequently to purge to enable EGR.

If battery state of charge is higher than threshold value electric charge, then can determine that battery can not accept further charging.Therefore, at 412 places, the engine torque demand that response reduces, forbids motor fueling, operates the motor/generator of hybrid vehicle system simultaneously.As a result, although forbidding motor, motor torsional moment is used to replace Engine torque propelled vehicles.At 414 places, for accelerating to purge LP-EGR from engine intake manifold, this program comprises and rotates unfed motor via motor/generator.Such as, unfed motor can be rotated via generator and reach extra 1-3 second.In addition, while rotary engine, each in the EGR valve in LP-EGR passage and the air inlet shutter in gas-entered passageway can open completely.By during rotation opening EGR valve and air inlet shutter completely, egr system and air induction system can be purged exhaust gas debris and be filled by new charge air again.

Rotate unfed motor via motor and comprise the electric energy operate generator of use from system battery with rotary engine under selected engine speed.Unfed motor can be rotated under based on the selected engine speed of the engine speed before fuel shutoff sparger.Such as, controller can operate generator to maintain close to the engine speed of rotary engine before fuel injector forbidding.As another example, generator can rotate unfed motor under following engine speed, and namely this engine speed is the function (such as, mark) of the engine speed of rotary engine before forbidding close to fuel injector.Alternately, selected engine speed can be to motor and all effective speed of speed changer.Like this, the function that the purge time required for EGR will be engine speed and throttle position is purged completely.

In alternative example, unfed motor can be rotated under based on the rotating speed of car speed.Such as, engine speed can be set to calibration speed, and it is stored in the controller storage in the look-up table accessed according to car speed.In another example, can rotary engine under the rotating speed of the rotational speed (or rotational velocity limit) of the rotary component based on car speed and planetary type gear transmission unit.Motor/generator arranges and can be adjusted to make motor can rotate under selected engine speed via motor torsional moment.In certain embodiments, can each in operate generator and motor in case under selected engine speed rotary engine.In further embodiments, generator is only had can to need to be operated.

In another example, unfed motor can be rotated under the engine speed corresponding at least starting rotational velocity of motor.Except accelerating EGR and purging, it allows motor (such as operator's accelerator releasing and the situation of then stepping on the gas very soon) when driver changes operation idea to reset rapidly.Such as, the instruction that operation response person unthinks, controller can start with to motor fueling and from starting rotational velocity acceleration rotary engine, to meet operator's torque demand.

In another example, unfed motor can be rotated allowing EGR by under the engine speed that purges as quickly as possible.At this, engine speed can be selected based on the air inlet EGR level of (time such as, at operator's accelerator releasing pedal) when reducing engine torque demand.Such as, engine speed instantaneously can rise to and not affect moment of torsion and export but allow EGR maximumly to be allowed engine speed by what purge as quickly as possible.In another example, allowing EGR so that unfed motor can be rotated compared with low rate by under the engine speed that purges.Such as, the engine load/torque demand of operator's accelerator releasing pedal and reduction can be there is during vehicle descent run.By pressing Vehicular instrument panel on button or via the interactive display on the central control desk of vehicle, operator can indicate remote descent run section.By indicating remote descent run, operator can indicate motor can shut down one period of long period.Therefore, during descent run, unfed motor can be rotated via generator, EGR can be completed till making to have obtained descent run and purge.

In further example, substitute and continue rotary engine until EGR is purged, unfed motor can be rotated off and on via generator.Such as, during descent run, unfed motor can be driven pulsedly to purge EGR via generator.

At 416 places, can determine whether fully to have purged EGR from engine intake manifold.Such as, can determine that whether EGR (flow, amount, concentration, level etc.) in air inlet system is lower than threshold value.In a kind of example, the air inlet lambda sensor of the sensor 372 of such as Fig. 3 can be used to estimate the EGR concentration in air inlet system.Wherein, the decline of air inlet oxygen concentration can be used to the increase of inferring EGR dilution transmission.In a kind of example, threshold value is based on the EGR tolerance of the motor under low engine load operating mode.Such as, along with EGR tolerance increases, threshold value can increase.

If LP-EGR is not less than threshold value, then controller fully can be purged to EGR via the unfed engine direct of the lasting rotation of motor/generator.If EGR is lower than threshold value, then at 420 places, this program comprises rotary engine to static.Such as, motor can rotate to static via motor, and rear engine can maintain shutdown, until meet motor to reset operating mode.Meanwhile, motor torsional moment can be used to continue propelled vehicles.Like this, it allows LP-EGR speed to be reset (such as, to zero), makes when motor is reset, known, higher LP-EGR speed can be realized, to improve the engine efficiency in the crucial intermediate region of speed-load mapping.

At 430 places, can determine that motor is reset operating mode and whether met.Such as, response battery state of charge lower than threshold value charge level, receive air conditioning request, operator's torque demand higher than one or more in threshold quantity etc., motor can be reset.If do not meet motor to reset operating mode, then motor can maintain shutdown, and vehicle can continue to be pushed into via motor.Otherwise at 432 places, response meets resets operating mode, and motor can be reset, and motor fueling can be resumed.At this, once reset motor, then EGR can be activated, and is purged due to motor, thus can realize higher EGR flow rate.

Get back to 411, if battery SOC is lower than threshold value electric charge, then can determine that battery can accept further charging.Therefore, operate vehicle in either a generation by instantaneous, EGR purges and can be activated.Particularly, at 422 places, this program comprises the engine load operating mode forbidding EGR that response reduces.Forbidding EGR comprises the EGR valve of closing and being connected in LP-EGR passage, to forbid that exhaust gas debris is recycled to the intake manifold of upstream of compressor by gas exhaust manifold from turbine downstream further.

At 424 places, this program is included in EGR forbidding and engine output torque operates motor higher than when demand torque.That is, until the EGR in engine intake duct is fully purged, motor can continue to be rotated with fueling under the engine output torque generated exceedes the torque condition of vehicle propulsion demand.By operating the motor of fueling when EGR valve is closed, the new charge air be inhaled in air induction system can replace air inlet EGR, thus accelerates EGR purging.In a kind of example, operate the motor 1-3 second of fueling when EGR valve is closed.

Also at 424 places, this program comprises charges to system battery with excessive engine output torque.That is, the engine output torque exceeding the moment of torsion of demand utilizing the motor operation period when EGR is forbidden to generate charges to system battery.Charge the battery to comprise and use excessive engine output torque operate generator, this generator is connected to battery.In a kind of example, motor operates 1-3 second in either a generation.

Operate when the moment of torsion of engine output torque higher than demand motor be included in based on system battery state of charge and reduce engine torque demand time engine intake duct EGR level in one or more engine speed under operate motor.Such as, engine speed can based on the charge acceptance of battery.Therefore, along with the increase (and therefore the charge acceptance of battery increases) of difference between battery SOC and threshold value electric charge, the engine speed of operation motor can increase.Engine speed also can based on the EGR level in air inlet system during operator's accelerator releasing pedal.Such as, along with EGR level during accelerator releasing increases, more purging can be needed, and therefore engine speed can increase.In other example, engine speed can be further adjusted based on car speed.

At 426 places, as at 416 places, can determine whether fully to have purged LP-EGR from engine intake manifold.Such as, can determine that whether EGR (flow, amount, concentration, level etc.) in air inlet system is lower than threshold value.This threshold value can based on the EGR tolerance of the motor under low engine load operating mode.

If LP-EGR is not less than threshold value, then controller can continue at EGR forbidding and the excessive Engine torque generated and this excessive-torque are stored as the electric charge in system battery operate the motor of fueling, until EGR is fully purged.At 428 places, when the EGR in air inlet system is less than threshold value, this program comprise inactive fuel to motor and the motor that is rotated in deceleration to static.Then motor can maintain and shut down until meet motor to reset operating mode.Meanwhile, the motor torsional moment propelled vehicles from motor/generator can be used.Like this, it allows LP-EGR speed to be reset (such as, to zero), makes when motor is reset, known, higher LP-EGR speed can be realized, to improve the engine efficiency in the crucial intermediate region of speed-load mapping.

This program proceeds to 430 to determine that motor is reset operating mode and whether is satisfied from 428, resets operating mode, then reset motor at 432 places if met.Once reset motor, then EGR can be activated, and is purged due to motor, thus can realize higher EGR flow rate.

By this way, at 422-428 place, when from during operating motor accelerator releasing when EGR flow, although battery state of charge is lower than threshold value electric charge, but can charge the battery by operating motor when EGR is forbidden, until engine charge EGR level is lower than threshold value, operation motor is to generate than required more moment of torsion.At this, operate motor to be included in the EGR valve be connected in low pressure EGR paths to open (such as when EGR flow, open completely) when operate motor, and operate when EGR is forbidden when motor is included in EGR valve cut out (such as, cutting out completely) and operate motor.Once engine charge EGR level is lower than threshold value, then power operation and battery charging can be interrupted.

Be to be understood that, although the program of Fig. 4 illustrate when by rotate via generator unfed motor or by EGR forbidding and charge the battery based on the charge acceptance (or SOC) of system battery operate fueling motor between select to purge the LP-EGR in motor vehicle driven by mixed power, but in alternative example, controller can be configured during the engine load/torque demand operating mode reduced, and selects based on the LP-EGR level in engine intake duct.Such as, if LP-EGR level is higher during operator's accelerator releasing pedal, then controller can be selected by rotating unfed motor to purge via generator.Otherwise if LP-EGR level is lower when operator's accelerator releasing pedal, then controller can select the motor by operating fueling in either a generation when EGR is forbidden to purge.Further, in some instances, controller can be configured and select to rotate unfed motor via generator and purge option by default.Then controller can purge option overriding/override acquiescence based on operator's input power generation mode and purge option.

Although should be appreciated that the program of Fig. 4 illustrates that the EGR of engine load/torque demand (such as due to operator's accelerator releasing) that response reduces purges, in alternative example, EGR can be initiated when anticipating that motor is shut down and purge.Such as, based on vehicle working condition, vehicle control device can be determined that imminent motor is shut down and can start EGR before generation shut down by the motor of expection and purge.At this, can input independent of operator and perform EGR purging, such as, independent of operator's accelerator releasing pedal event or operator demand.In fact, EGR purges vehicle working condition (such as, car speed, the ambient humidity etc.) execution of the frequency that can shut down based on determining motor and reset.Purging by initiating EGR when anticipating that motor is shut down, decreasing additional purging and postponing.

By this way, LP-EGR can be purged rapidly, and EGR level can be reset during the engine torque demand operating mode reduced.Rapid purging decreases the combustion stability risk be associated with the EGR be detained under running on the lower load.In addition, resetting of EGR level allows to realize higher EGR speed during increase engine torque demand to moderate duty operating mode.

In one example, hybrid vehicle system comprises motor, and motor comprises air inlet system and venting gas appliance; Air inlet shutter; Be connected to the electric motor/generator of battery; And the vehicle wheel using the moment of torsion from one or more in motor and motor to advance.Hybrid vehicle system also comprises the direct fuel sparger being connected to engine cylinder; Comprise the turbosupercharger of the inlet air compressor driven by exhaust driven gas turbine; And for the EGR channel of the air inlet system that EGR flow to upstream of compressor from the venting gas appliance in turbine downstream via EGR valve.This Vehicular system can comprise the controller with computer-readable instruction, for when during the accelerator releasing operating motor when EGR flow, and forbidding fuel injector; That opens in EGR valve and air inlet shutter completely is each; And use from the moment of torsion of motor to meet operator's torque demand and to rotate unfed motor, engine revolution continues for some time until in-engine EGR is lower than threshold value.At this, rotate until in-engine LP-EGR lower than threshold value comprise rotation until motor intake manifold in LP-EGR amount lower than threshold value, threshold value is based on torque demand.In a kind of example, rotate until in-engine LP-EGR comprises rotation lower than threshold value until LP-EGR flowing is in zero flowing.Rotary engine is included in and is in or higher than rotary engine under the engine speed of engine start rotational velocity.Controller can comprise further instruction, and it, continues to use motor torsional moment to meet torque demand to static and maintain motor and shut down for rotary engine over time simultaneously.

In another example, the controller of above-mentioned hybrid vehicle system comprises computer-readable instruction, and it operates motor when EGR flow for: operation response person's accelerator releasing pedal simultaneously, estimates battery state of charge; And if the battery state of charge estimated is lower than threshold value electric charge, close EGR valve; Operate motor a period of time when EGR valve is closed until in-engine EGR is lower than threshold value, operation motor is to generate moment of torsion more more than required moment of torsion; And charge the battery with the excessive Engine torque generated, operate motor when EGR valve is closed simultaneously.At this, operate motor when EGR valve is closed and can be included in based on rotary engine under one or more the engine speed in air inlet EGR level when the state of charge of battery during accelerator releasing and accelerator releasing.Further, operate when EGR valve is closed engine direct to in-engine EGR lower than threshold value can comprise operation engine direct be in zero flowing to EGR flow.Controller can comprise further instruction, its for: if estimate battery state of charge higher than threshold value electric charge, forbidding fuel injector; Open EGR valve and air inlet shutter completely; And use the moment of torsion of self generator to meet operator's torque demand and to rotate unfed engine direct to in-engine EGR lower than threshold value.

With reference now to Fig. 6, example illustrates example EGR purge operations.Particularly, map 600 and describe engine speed at curve 602 place, motor torsional moment is described at curve 604 place, LP-EGR is described at curve 606 place, describe fuel to spray at curve 608 place, describe battery state of charge (SOC) at curve 610 place, and describe the position of LP-EGR valve at curve 614 place.

Before t1, can operate motor vehicle driven by mixed power, wherein the major part of wheel moment of torsion is provided by motor and the smaller portions of wheel moment of torsion are provided by motor.Therefore, the motor (curve 608) corresponding to and only can rotate fueling from the engine speed to the operation (curve 602) in high-load region in a certain auxiliary (curve 604) of motor is utilized.When in operate in high-load region time, LP-EGR can flow (curve 606), such as, utilize the straight planning providing EGR relative to air stream with fixed rate.Particularly, LP-EGR valve can be opened (curve 614).In described example, LP-EGR valve shows the on-off valve for changing between fully open position and complete closed position.But in other examples, the aperture of EGR valve can be adjusted changeably based on LP-EGR demand.During power operation before t1, battery state of charge can higher than threshold value 612, and battery may not accept further charging (curve 610).

At t1 place, operator's accelerator releasing pedal can occur, thus causes engine load to be reduced to running on the lower load.The engine torque demand that response reduces, the EGR to motor can reduce.Like this, if adjustment LP-EGR valve (such as, cutting out) to reduce EGR, then due to the precompactors position that EGR transmits, can there is large transmission delay, and EGR may not reduce as expected so fast.Such as, EGR can reduce according to the profile of phantom line segments 609a.This existence of excessive dilution that will cause in engine intake manifold in low-load conditions, thus add and catch fire and the possibility of stability problems.

In order to improve the purging of LP-EGR under running on the lower load and make minimum (such as, zero delivery) EGR can be provided to motor in low-load conditions, EGR can utilize the auxiliary of system generator to be purged rapidly.At this, because battery state of charge is higher than threshold value 612, can ask to utilize the auxiliary of generator to purge.Particularly, at t1 place, the fuel to motor sprays and is prohibited, thus causes the decline of engine speed.In addition, motor/generator exports to be increased, to provide enough motor torsional moment with propelled vehicles and to meet operator's torque demand, also provides enough motor torsional moment to rotate unfed motor simultaneously.Like this, if inoperation motor/generator, motor can be rotated in deceleration to static according to the profile of phantom line segments 603.When rotating unfed motor via motor/generator, LP-EGR valve can keep opening completely.In addition, air inlet shutter (not shown) can be opened completely.This allows the EGR in air induction system to be replaced with rapidly new charge air.

Rotate unfed motor and be included in engine speed 601 times rotary engines.Engine speed 601 can be start rolling motor rotating speed (cranking engine speed).Alternately, engine speed 601 can correspond to fuel injector stop using before engine speed, or its function.Further, engine speed 601 can correspond to motor and speed changer is the most effective engine speed.Like this, motor can rotate a period of time via motor between t1 and t2, until LP-EGR is fully purged.Such as, motor can rotate, until LP-EGR is in or is less than minimum EGR level 611 for 601 times in engine speed.In alternative example, EGR level 611 can comprise does not have EGR flow, and make does not provide LP-EGR under lower engine load operating mode.

At t2 place, once EGR is fully purged, then allow engine stop.In addition, LP-EGR valve cuts out.Then, motor maintain shut down until meet reset operating mode (at t3 place).Meanwhile, between t2 and t3, can adjust motor operated, make to produce enough motor torsional moments with propelled vehicles.Between t1 and t3, when motor do not operate and motor torsional moment for propelled vehicles and/or rotate unfed motor time, battery SOC can decline.Such as, at t3 place, battery SOC can be brought down below threshold value 612.

At t3 place, responding engine resets operating mode (such as because operator's torque demand rises), and the fuel to motor sprays can be initiated again, and Engine torque can increase with propelled vehicles.Meanwhile, owing to using Engine torque propelled vehicles to a great extent, thus motor torsional moment can reduce.Although motor torsional moment reduces to reduced levels shown in described example, in alternative example, the use of motor torsional moment can be completely interrupted.Also at t3 place, LP-EGR valve is opened, to reactivate EGR during power operation.Further, because LP-EGR is reset at t2 place, so during t3 place resets higher load, higher LP-EGR peak rate can be transmitted.

Vehicle operating when power operation and EGR transmit can continue until t4.Like this, time enough can (dotted line is described) disappearance between t3 and t4.At t4 place, motor vehicle driven by mixed power can operate with pure engine mode when motor meets wheel torque demand.When LP-EGR flowing (and LP-EGR valve is opened), in corresponding to, the motor of fueling can be rotated under the engine speed of the operation in higher load region.Such as, LP-EGR can be provided according to the straight planning relative to air stream with EGR fixed rate.During t4 place power operation, battery state of charge can lower than threshold value 612, and battery can accept further charging.

At t5 place, as at t1 place, operator's accelerator releasing pedal can occur, thus causes engine load to be reduced to running on the lower load.The engine load that response reduces, the EGR to motor can reduce.Particularly, LP-EGR valve cuts out to reduce EGR.But, even if when EGR valve is closed, due to the precompactors position that EGR transmits, also can there is large transmission delay, and EGR may not reduce as expected so fast.Such as, EGR can reduce according to the profile of phantom line segments 609b.This existence of excessive dilution that will cause in engine intake manifold in low-load conditions, thus add and catch fire and the possibility of stability problems.

In order to improve the purging of LP-EGR under running on the lower load and make minimum (such as, zero delivery) EGR can be provided to motor in low-load conditions, EGR can be purged rapidly by operating hybrid vehicle system in either a generation.At this, because battery state of charge is lower than threshold value 612 and battery can accept charging, can ask by operating motor in either a generation to purge.Particularly, at t5 place, maintain motor fueling and operation, but EGR is disabled.The fuel being adjusted to motor sprays, to generate the Engine torque exceeding propelled vehicles and meet needed for operator's torque demand.When doing like this, motor is in the rotating speed 605 time operation higher than the rotating speed (as shown in phantom line segments 607) otherwise needed for propelled vehicles.By operating motor when EGR valve is closed with higher rotation speed, the EGR in air induction system can be replaced with rapidly new charge air, thus allows EGR faster to purge.Then the excessive-torque generated by motor can be used to charge the battery.Therefore, battery state of charge can start to rise after t5.

Operation motor is included in engine speed 605 times rotary engines to generate excessive-torque.Engine speed 605 can based on battery SOC when LP-EGR level during accelerator releasing (at t5 place) and accelerator releasing.Along with battery state of charge reduces, higher engine speed 605 (engine speed 607 relative to otherwise needed for propelled vehicles) can be applied, and because battery can accept more substantial electric charge, the excessive-torque of higher level thus can be generated to purge EGR.Similarly, along with LP-EGR level increases, and need more purging, engine speed 605 can promote further relative to engine speed 607.

At EGR disabled and generate excessive Engine torque, motor operates a period of time between t5 and t6, until LP-EGR is fully purged.Such as, motor can continue in engine speed 605 times operations, until LP-EGR is in or is less than minimum EGR level 611.In alternative example, EGR level 611 can comprise does not have EGR flow, and make does not provide LP-EGR under lower engine load operating mode.Also between t5 and t6, battery state of charge can continue to increase, until its before t6 higher than threshold value 612.

At t6 place, once EGR is fully purged, then allow engine stop.Particularly, motor fueling is prohibited, and allows engine revolution to static.Then, motor maintain shut down until meet reset operating mode (at t7 place).Meanwhile, between t6 and t7, the motor of operating vehicle systems carrys out propelled vehicles to generate enough motor torsional moments.

At t7 place, responding engine resets operating mode (such as because operator's torque demand rises), and the fuel to motor sprays can be initiated again, and Engine torque can increase with propelled vehicles.Meanwhile, motor torsional moment can reduce (such as, interrupting), makes to use Engine torque propelled vehicles.Further, because LP-EGR is reset at t6 place, so during t7 place resets higher load, higher LP-EGR peak rate can be transmitted.

By this way, from the first engine shutdown operated with EGR, controller can be forbidden fuel and spray, and rotates unfed motor via motor, until EGR is lower than threshold value.By contrast, from the second engine shutdown operated with EGR, controller can forbid EGR, and rotates the motor of fueling, until EGR is lower than threshold value, charges the battery with excessive Engine torque simultaneously.At this, at the first engine shutdown, when rotating unfed motor; motor torsional moment is used for propelled vehicles and rotary engine; and at the second engine shutdown, when rotating the motor of fueling, Engine torque is used to propelled vehicles and charges the battery.Further, at the first engine shutdown, battery state of charge is higher than threshold value electric charge, and at the second engine shutdown, battery state of charge is lower than threshold value electric charge.At the first engine shutdown; under the engine speed of the engine speed before spraying based on forbidding fuel; rotate unfed motor, and at the second engine shutdown, under the engine speed based on the EGR level before forbidding EGR, rotate the motor of fueling.

By this way, during the engine load/torque demand operating mode of selected reduction, the motor torsional moment of hybrid vehicle system can be advantageously used in the EGR purged in low engine load region and the EGR improved in intermediate load region and transmit.By controlling motor rotary speed with optionally rotary engine after cutting off at fuel, in motor boosting volume, the EGR of trapping can be purged rapidly.During the engine load operating mode that other reduce, the electric charge ability to accept of hybrid vehicle system can be advantageously used in the EGR purged in low engine load region.Be stored in battery by making excessive Engine torque, motor can in comparatively high-engine rotating speed (and when exporting compared with high-engine) operation, EGR is disabled simultaneously, thus allows the EGR in air induction system to be replaced by fresh air rapidly.By accelerating the purging of EGR, LP-EGR speed can reduce in low-load conditions quickly.Such as, LP-EGR speed can be reset in low-load conditions.This existence due to dilution excessive under running on the lower load and reduce to catch fire and combustion instability may.When motor is reset, the purging of quickening allows to realize higher LP-EGR speed further.Like this, it allows motor to be used in its peak efficiency operating area.Particularly, engine efficiency can be enhanced substantially in intermediate load region.Interaction effect between boosting motor and the application of dynamic branch mixed power also allows the fuel economy begetting power of LP-EGR to be enhanced, and reduce compromise to EGR speed, such as when with the running of LP-EGR in low-load conditions during straight EGR program operation and in attainable lower peak value EGR speed under high load operating mode.Generally speaking, vehicle performance and engine fuel economy is improved.

Note, use together with can configuring with various motor and/or Vehicular system with estimation routine in this exemplary control comprised.Controlling method disclosed herein and program can be stored as the executable instruction in nonvolatile storage.Specific program described herein can represent in the processing policy of any number one or more, such as event-driven, drives interrupts, Multi task, multithreading etc.Like this, illustrated various actions, operation and/or function can order illustratively perform, executed in parallel or be omitted execution in some cases.Equally, the order of process is not that to realize the feature and advantage of exemplary embodiment described herein necessary, but for being easy to illustrate and description provides.According to used specific strategy, what can repeat in illustrated behavior, operation and/or function is one or more of.Further, described behavior, operation and/or function can represent graphically to be programmed into the code in the non-transitory storage of the computer-readable recording medium in engine control system.

Should be clear, because may there be many changes, so configuration disclosed herein and program are exemplary in itself, and these specific embodiments should not be regarded as having limited significance.Such as, above-mentioned technology can be applicable to V-6, I-4, I-6, V-12, opposed 4 cylinders and other engine types.Theme of the present disclosure comprises various system disclosed herein and configuration, and all novelties of further feature, function and/or character with non-obvious combination and sub-portfolio.

Claim of enclosing specifically note be regarded as novel in non-obvious some combination and sub-portfolio.These claims can refer to " one " element or " first " element or its equivalent.This type of claim should be understood to the combination comprising this class component one or more, both two or more these class components neither requiring nor excluding.Other combination of disclosed feature, function, element and/or character and sub-portfolio are by the amendment of this claim or by the in addition requirement of the new claim that presents in the application or related application.This type of claim, no matter wider than original claim scope, narrower, identical or different, be still deemed to be included in theme of the present disclosure.

Claims

1. for a method for hybrid vehicle system, it comprises: the engine load that response reduces operates motor when there being EGR simultaneously,

Forbid that fuel is to described motor, use motor torsional moment to advance described vehicle simultaneously; And rotate unfed described motor, until the EGR in engine intake duct is less than threshold value via described motor.

2. method according to claim 1, wherein when there being EGR, operation is included in when low pressure EGR and LP-EGR are in fixed rate relative to air stream and operates, and described LP-EGR comprises the exhaust gas debris of the cooling being recycled to the intake manifold of inlet air compressor upstream from the gas exhaust manifold in exhaust driven gas turbine downstream.

3. method according to claim 2, what wherein rotate that unfed described motor is included in EGR valve and air inlet shutter eachly rotates unfed described motor when opening all completely.

4. method according to claim 3, wherein said threshold value is based on the EGR tolerance of described motor under low engine load operating mode.

5. method according to claim 4, the engine load operation response person accelerator releasing pedal of wherein said reduction.

6. method according to claim 5, rotates unfed described motor under wherein rotating via described motor the described engine speed that unfed described motor is included in based on the engine speed of forbidding motor fueling.

7. method according to claim 6, wherein rotates unfed described motor and comprises the described motor of operation to rotate described motor under described selected engine speed, use the electric energy from battery to operate described motor.

8. method according to claim 7, also comprises: when EGR is less than described threshold value, is rotated in deceleration unfed described motor to static via described motor, and maintains the shutdown of described motor.

9. method according to claim 5, wherein rotate under unfed described motor is included in starting rotational velocity via described motor and rotate described motor, described method also comprises, the instruction that operation response person unthinks, to described motor fueling and from the described motor of described starting rotational velocity acceleration rotation.

10. method according to claim 1, wherein operate when there being EGR described motor be included in low pressure EGR flowing and fuel via directly spray be sent to boosting motor when boost operations described in motor.

11. methods according to claim 1, wherein said hybrid vehicle system is dynamic branch hybrid vehicle system.

12. 1 kinds, for the method for the motor in hybrid vehicle system, comprising:

When from having the first engine shutdown operated when EGR, prohibition of fuel injection, and rotate unfed described engine direct to described EGR lower than threshold value via motor; And

When from there being the second engine shutdown operated when EGR, forbid EGR, and the described engine direct rotating fueling to described EGR lower than described threshold value, charge the battery with excessive Engine torque simultaneously.

13. methods according to claim 12; wherein at described first engine shutdown; while unfed described engine revolution; motor torsional moment is used to advance described vehicle and rotates described motor; and wherein at described second engine shutdown; while the described engine revolution of fueling, Engine torque is used to advance described vehicle and charges to described battery.

14. methods according to claim 12; wherein at described first engine shutdown; the state of charge of described battery is higher than threshold value electric charge, and wherein at described second engine shutdown, the described state of charge of described battery is lower than described threshold value electric charge.

15. methods according to claim 12; wherein at described first engine shutdown; unfed described motor is rotated under the engine speed based on the engine speed before prohibition of fuel injection; and wherein at described second engine shutdown, under the engine speed based on the EGR level before forbidding EGR, rotate the described motor of fueling.

16. 1 kinds of hybrid vehicle systems, it comprises:

Comprise the motor of air inlet system and venting gas appliance;

Air inlet shutter;

Be connected to the electric motor/generator of battery;

Use the vehicle wheel advanced from the one or more moment of torsion in described motor and described motor;

Be connected to the direct fuel sparger of engine cylinder;

Comprise the turbosupercharger of the inlet air compressor driven by exhaust driven gas turbine;

For EGR to be flow to the EGR channel of the described air inlet system of described upstream of compressor via EGR valve from the described venting gas appliance in described turbine downstream; And

There is the controller of computer-readable instruction, its for:

When from during having the described motor accelerator releasing that operates when EGR flow,

Forbid described fuel injector;

That opens in described EGR valve and described air inlet shutter completely is each; And

Use the moment of torsion from described motor meet operator's torque demand and rotate unfed described motor, described engine revolution continues for some time until described in-engine EGR is lower than threshold value.

17. systems according to claim 16, wherein rotate until described in-engine LP-EGR comprise rotation lower than threshold value until described motor intake manifold in the amount of LP-EGR lower than described threshold value, described threshold value is based on described torque demand.

18. systems according to claim 16, wherein rotate until described in-engine LP-EGR comprises rotation lower than threshold value until LP-EGR flowing is in zero flowing.

19. systems according to claim 16, wherein rotate described motor and are included in and are in or rotate described motor under engine speed higher than engine start rotational velocity.

20. systems according to claim 16; wherein said controller comprises further instruction; its for rotate after described a period of time described motor to static and maintain described motor shut down, simultaneously continue use motor torsional moment meet described torque demand.